CN102148407B - Prismatic sealed secondary cell and method of manufacturing the same - Google Patents

Prismatic sealed secondary cell and method of manufacturing the same Download PDF

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Publication number
CN102148407B
CN102148407B CN201110036946.XA CN201110036946A CN102148407B CN 102148407 B CN102148407 B CN 102148407B CN 201110036946 A CN201110036946 A CN 201110036946A CN 102148407 B CN102148407 B CN 102148407B
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core body
connecting conductive
conductive parts
plate
exposed division
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CN102148407A (en
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上藤大辉
木村毅典
山本康介
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49108—Electric battery cell making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49108—Electric battery cell making
    • Y10T29/49115—Electric battery cell making including coating or impregnating

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The present invention provides a prismatic sealed secondary cell that is excellent in current collection efficiency and current collection stability, and capable of high output discharge. In the prismatic sealed secondary cell in which a laminate-type or a wound laminate-type of flat electrode assembly is housed in a prismatic cell case, a pair of current collector plates 20, 20 are disposed on a flat portion of the outermost surface of the core exposed portion 5b of the first electrode plate constituting the flat electrode assembly so that the pair of current collector plates 20, 20 sandwich the flat portion in the thickness direction, and a columnar connection conductive member is interposed between two-divided core exposed portion laminates 12', 12' in the flat portion sandwiched between the pair of current collector plates 20' 20, and the pair of current collector plates, the columnar connection conductive member 30 and the two-divided core exposed portion laminates 12' 12' are welded to each other.

Description

The manufacture method of prismatic sealed secondary battery and prismatic sealed secondary battery
Technical field
The present invention relates to the slip ring system structure of the current collection stability improving prismatic sealed secondary battery.
Background technology
In recent years, electrical motor vehicle (EV), hybrid motor vehicle (HEV) etc. be that the battery-operated motor vehicle of driving power is popularized gradually with secondary cell, but battery-operated motor vehicle needs the high secondary cell exported.And, due to the further multifunction of the mobile electronic equipment such as portable phone or notebook computer, and need further high output in their purposes.
In the high output of battery, need the opposing area increasing positive and negative electrode.Be laminated with the multilayer electrode body structure of multiple positive-negative electrode plate or rectangular positive-negative electrode plate clipped vortex electrode body structure that dividing plate carries out reeling due to the opposing area of positive and negative electrode can be increased, therefore easily realizing the high output of battery.
In the secondary cell employing multilayer electrode body or vortex electrode body, adopt at the core body exposed division welding collector plate making the core body of positive and negative electrode expose and the structure that this collector plate is connected with outside lead-out terminal, but export in battery at height, the situation of stably taking out big current is very important.In order to stably take out big current, increase the contact area of collector plate and positive and negative electrode core body and to increase the situation of pad more favourable.Thus, use the collector plate of wide cut all the time and increase the welding position of collector plate and positive and negative electrode core body.
But, in the Large Copacity secondary cell of the winding number of battery lead plate or the many stacked type of stacked number, be difficult to make the contact area often extending collector plate in area and battery lead plate of battery lead plate to increase.Only use the collector plate of wide cut stably cannot take out big current.
About the technology of the resistance reduced in slip ring system, proposed there is various current collecting in the past.The technology having following patent documentation 1 ~ 4 is such as proposed.
Patent documentation 1: Japanese Unexamined Patent Publication 2003-249423 publication (summary)
Patent documentation 2: Japanese Unexamined Patent Publication 58-113268 publication (requirement of utility model logon right)
Patent documentation 3: Japanese Unexamined Patent Publication 2000-40501 publication (Fig. 7)
Patent documentation 4: Japanese Unexamined Patent Publication 2001-257002 publication
Patent documentation 5: Japanese Unexamined Patent Publication 2006-228551 publication
Patent documentation 1 discloses a kind of technology: the core body stacked in the thickness direction both sides of the electrode body being wound into flat is divided into two and concentrates, (winding inner peripheral portion) inserts the collector body of U-shaped between which, carries out current collection by these parts.According to this technology, the width of the part (connecting the part of current-collecting terminals) be wound owing to can reduce to expose from dividing plate, therefore, it is possible to improve the ability of every volume of battery.
Patent documentation 2 disclose a kind of will be divided in the lower side of pole two and the pole plate lug group concentrated respectively be configured in the pole plate lug group terminal be integrally welded together with the backing plate outside this ear group and assemble device.According to this technology, circuit passband can be formed shortlyer and can bonding area be increased.
Patent documentation 3 discloses a kind of current-collecting terminals connecting portion (part for electrode terminal) concentrating the mid portion having the electrode body thickness direction of electrode core body to insert rectangular slab shape, and carries out the structure of current collection via current-collecting terminals connecting portion.If this structure, then contact resistance can be reduced, therefore, it is possible to provide a kind of rolled electrode battery of resistance to big current.
A kind of current collecting that can reduce internal resistance is disclosed in patent documentation 4,5.
Summary of the invention
The object of the invention is to work out a kind of can improve battery lead plate winding number or the many jumbo prismatic sealed secondary battery of stacked number in current collecting efficiency or the slip ring system structure of current collection stability, provide a kind of thus and stably can take out the large prismatic sealed secondary battery exported.
The first invention for solving the prismatic sealed secondary battery of above-mentioned problem at least comprises: this first battery lead plate and this second battery lead plate clipped the stacked or flat electrode body be laminated that reels of dividing plate to make the first battery lead plate and the second battery lead plate core body exposed division separately mode opposed in the direction of the width, this first battery lead plate is formed with core body exposed division in the end side of Width, and this second battery lead plate is formed with core body exposed division and different from the polarity of described first battery lead plate in the end side of Width, the collector plate engaged with described first battery lead plate, the outside lead-out terminal that can be energized is connected into via described collector plate and described first battery lead plate, accommodate the rectangular cell case of described flat electrode body, the feature of described prismatic sealed secondary battery is, the plat part part of the outermost layer part that a pair collector plate exposes at the core body exposed division of the first battery lead plate forming described flat electrode body and described flat electrode body configures in the mode clipping this plat part part from thickness direction, stacked group of core body exposed division in the plat part part clipped by described a pair collector plate is divided into two parts, the connecting conductive parts of column clamp between these two portions, described a pair collector plate, described connecting conductive parts and be divided into two-part core body exposed division stacked group of soldered joint.
In order to realize high capacity and the high-energy-density of prismatic sealed secondary battery, and needing to use thin electrode core body, making it keep active material as much as possible, and by stacked for the battery lead plate so made or the laminated multi-layer that reels.But, when electrode core body is thin, fragile and easily damaged, and resistance increases, and is therefore difficult to stably carry out big current current collection.
The present invention is housed in prismatic sealed secondary battery in rectangular cell case for object with the flat electrode body that stacked or winding are laminated with the first battery lead plate and the second battery lead plate.First electrode core body exposed division of this flat electrode body exposes to an end face side of flat electrode body, and the second electrode core body exposed division exposes to side, other end.
In the battery of this structure, the present invention adopts following structure: the end that the core body exposed division of the first electrode in the flat part of flat electrode body exposes configures a pair collector plate in the mode clipping this end from thickness direction, connecting conductive parts are clamped, in this condition by the connecting conductive parts of a pair collector plate, column and be divided into the stacked bond pads of two-part core body exposed division and engage in the centre (being divided between stacked group of two-part core body exposed division) of the core body exposed division stacked group of part clipped by a pair collector plate.
If be formed as stacked group of core body exposed division be divided into two parts and in the structure being divided into sandwiched connecting conductive parts between stacked group of two-part core body exposed division, then two-part plate electrode layer stacked group will be able to be divided into connect to and can be energized by weld job once.Thus, compared with welded structure respectively, especially weld job can be improved.And, if be formed as in the structure being divided into sandwiched connecting conductive parts between stacked group of two-part core body exposed division, then with once weld stacked group of core body exposed division whole thickness situation compared with, the welding of high-quality can be carried out expeditiously.
Directly weld in order to stacked for core body exposed division group is not split on the thickness direction of offset flat shape electrode body, need be pressed into the central portion of the thickness direction of offset flat shape electrode body by stacked for core body exposed division group and weld.Polar body produces large deformation thus, and electrode core body produces fold or contraction in the process of melting and cooling, and the discomfort that therefore can form stress is present in inner offset flat shape electrode body.If in contrast, be formed as in the structure being divided into sandwiched connecting conductive parts between stacked group of two-part core body exposed division, then to weld under the state that the discomfort of stress is few, therefore, it is possible to form the excellent flat electrode body of shape stability.And, and stacked for core body exposed division group is not split on the thickness direction of offset flat shape electrode body and compared with the situation of directly welding, the width of the core body exposed division of each battery lead plate can be reduced.
Thus, according to said structure, can form and stably carry out current collection to big current and the slip ring system exported, such the present invention plays serviceability especially in the stacked number of battery lead plate or the many jumbo prismatic sealed secondary battery of the stacked number that reels.
At this, " battery lead plate " in said structure represents the parts being formed with active material at electrode cores body.And " the first battery lead plate " represents negative or positive electrode any one.And " the second battery lead plate " represents the electrode opposed with the first battery lead plate.And " stacked " represents that the first battery lead plate and the second battery lead plate are clipped dividing plate between to be piled up successively, " reeling stacked " represents that the first battery lead plate and the second battery lead plate are clipped dividing plate is wound into vortex shape.It should be noted that, in " reeling stacked ", be formed as from the winding center state stacked towards outside.
Only expression is divided into two parts " to be divided into two parts " in addition, is not to represent that namely even partition is evenly divided into two parts.Wherein, roughly uniform two parts also can be divided into, when " reeling stacked ", two parts that to be preferably divided into winding center axle be border.
In addition, " column " in " the connecting conductive parts of column " refers to that the diameter of connecting conductive parts is R, when being highly H, and H/R > 1.H/R preferably greater than 1 and less than 5, the more preferably scope of 2 ~ 3.At this, above-mentioned diameter R refers to the external diameter of a circle including cross section shape when cross sectional shape is non-circular connecting conductive parts.And, when the connecting conductive parts that thickness is uneven, be the value (mean value) minimum diameter in the cross section in the maximum gauge in the cross section in the thickest part and the thinnest part is added divided by 2.
In the structure of above-mentioned prismatic sealed secondary battery, the connecting conductive parts of described column can form forwards outstanding curved surface in two front ends abutted with described core body exposed division.
When being formed with the connecting conductive parts of forwards outstanding curved surface in two front ends if be formed as, make the curved surface forwards given prominence to reliably carry out and the contacting of the lamination surface of core body exposed division and collector plate when pressing, and become the centrostigma of Resistance welding current, therefore there is the effect can carrying out high efficiency resistance welded.
In the structure of above-mentioned prismatic sealed secondary battery, the connecting conductive parts of described column can form recess in two front ends abutted with described core body exposed division.
When being formed as being formed with the connecting conductive parts of the column of recess in the central authorities of front end, compared with being convex situation with front end, with core body exposed division to abut stability high, therefore, after being divided into the middle insertion connecting conductive parts of stacked group of two-part core body exposed division, be difficult to before welding misplace.And the sunk part of recess does not contact with core body exposed division, therefore electric current flows into from the ledge of the recess directly contacted with core body exposed division towards recess center.Thus, compared with the situation that front end is smooth, the degree of current convergence increases, and makes welding current focus on the axle center of connecting conductive parts, therefore effectively improves the temperature of answering welding portion.Thus, if be formed as this structure, then can realize the resistance welded of high-quality and good workability simultaneously.
In the structure of above-mentioned prismatic sealed secondary battery, the connecting conductive parts of described column can be tubular.
The situation that the connecting conductive parts of tubular are formed with the connecting conductive parts of the column of recess due to its two front end geometry and the central authorities in front end is identical, therefore can obtain action effect similar to the above.And, when being formed as tubular, compared with not being the connecting conductive parts of tubular, can weight reduction, therefore, it is possible to improve the gravimetric energy density of battery.
In above-mentioned being formed with in the structure of the connecting conductive parts of the column of recess and the connecting conductive parts of barrel shape in the central authorities of two front ends of use, the collector plate that surface is provided with the protuberance opposed with the recess on the front end being arranged on connecting conductive parts can be used in.
In the structure shown here, the axis of a cylinder of the protuberance (respective protuberance is outstanding to the front of connecting conductive parts) that the respective surface of a pair collector plate is arranged, the front end recess of connecting conductive parts or the hollow bulb (playing same function with front end recess) of cartridge and connecting conductive parts configures in the mode being arranged in a linearity.When being formed as this structure, if two collector plates that the outermost layer of stacked group of pressing core body exposed division configures respectively, then can press the core body exposed division part that protuberance that the surface of collector plate is arranged abuts more strongly, consequently, the medial surface that core body exposed division is stacked group protrudes convex.This projection slightly enters the recess of connecting conductive member forward end or the hollow space of cylinder, and is fixed two front ends of connecting conductive parts.Thereby, it is possible to carry out the more stable resistance welded of workability, the resistance welded of high-quality can be obtained.Consequently can obtain the excellent prismatic sealed secondary battery of big current current collection performance.
In the prismatic sealed secondary battery described in above-mentioned each structure, resin-made strengthening part can also be set at the waist portion of the connecting conductive parts of described column.
The connecting conductive parts of column are the parts guaranteeing the conducting being divided into stacked group of two-part core body exposed division mutual, and when connecting conductive parts are column, the area connected with core body is narrow and small, also easily make welding current concentrate even if therefore do not arrange protuberance.Thus, concentrating from the view point of welding current, the connecting conductive parts of preferably thin (diameter is little) column.But, if during thin column connecting conductive parts, by electrode for resistance welding rod from the poor stability above-below direction pressing situation, therefore easily there is failure welding.And column connecting conductive parts likely can be out of shape due to pressing force.
If be formed as when the waist portion of the connecting conductive parts of column arranges the said structure of resin-made strengthening part, the resin-made strengthening part be arranged on waist portion is strengthened connecting conductive parts, therefore prevents the distortion of connecting conductive parts.And the resin-made strengthening part be arranged on waist portion increases the post width of connecting conductive parts in appearance, therefore easy by connecting conductive component configuration between two partitioning boundaries.In addition, resin-made strengthening part usually than unit volume lightweight of connecting conductive parts, therefore with make compared with the thicker situation of connecting conductive parts self, the decline of the gravimetric energy density of battery is less.And, when resin-made strengthening part is insulating properties, the function of the useless contact preventing connecting conductive parts and battery lead plate can be played.
Above, when for using the structure of resin-made strengthening part, the prismatic sealed secondary battery corresponding to heavy-current discharge of reliability, excellent in stability can be realized.
At this, resin-made strengthening part does not preferably cover near two front ends of column connecting conductive parts.Two front ends are the parts receiving welding current, are also puddles.Specifically, the height of column connecting conductive parts is H2, when the height of resin-made strengthening part is H1, " H1/H2 " is " 1/3 ~ 1/1 ", be preferably " 1/2 ~ 10/11 ", and make the central authorities of the length direction of resin-made strengthening part consistent with the length direction central authorities of column connecting conductive parts.Thus, the part except near leading section in two front ends of column connecting conductive parts and waist portion is covered by resin-made strengthening part.
As long as resin-made strengthening part can play add powerful, its size or shape are not particularly limited.Wherein, the diameter R of column connecting conductive parts, when the thickness (covering the wall thickness of column connecting conductive parts) of resin-made strengthening part is for W, " W/R " is preferably more than 1/3.At this, in " W/R ", the column connecting conductive parts being provided with resin-made strengthening part are being determined centre of area point from the section that direction orthogonal to the longitudinal direction is cut open, is determining " R " and " W " from the radioactive ray of this central point.
In the prismatic sealed secondary battery described in above-mentioned each structure, described a pair collector plate can also be formed as and connect into the structure that can be energized with described outside lead-out terminal respectively.
Config set electroplax and form the structure being clipped flat part by least two collector plates respectively in the outmost surface of stacked group of the core body exposed division of the end of formation flat electrode body of the present invention.In the structure shown here, when a pair collector plate connect into outside lead-out terminal respectively can be energized time, can make from collector plate to the electric loading of the electrical path of outside lead-out terminal is 1/2, and the cell resistance therefore in current collection reduces further.
In the prismatic sealed secondary battery described in above-mentioned each structure, described flat electrode body can be that the Scrawl electrode body described first battery lead plate and described second battery lead plate being clipped dividing plate winding is processed into the Scrawl flat electrode body of flat.
Scrawl electrode body is processed into the Scrawl flat electrode body of flat owing to increasing winding number, and can manufacture in the excellent battery of the high volume energy density of productivity preferred.But when winding number increases, current collection resistance also increases, therefore flat part be divided into two parts and by column connecting conductive parts by when linking in the middle of it, can significantly reduce current collection resistance.Thus, action effect of the present invention can be played more significantly in the prismatic sealed secondary battery possessing Scrawl flat electrode body.
Next, the manufacture method that can be applicable to manufacturing prismatic sealed secondary battery of the present invention described above is recorded.
In the manufacture method of prismatic sealed secondary battery of the present invention, described secondary cell at least possesses: this first battery lead plate and this second battery lead plate clipped the stacked or flat electrode body be laminated that reels of dividing plate to make the first battery lead plate and the second battery lead plate core body exposed division separately mode opposed in the direction of the width, this first battery lead plate is formed with core body exposed division in the end side of Width, and this second battery lead plate is formed with core body exposed division and different from the polarity of described first battery lead plate in the end side of Width; The collector plate engaged with described first battery lead plate; The outside lead-out terminal that can be energized is connected into via described collector plate and described first battery lead plate; Accommodate the rectangular cell case of described flat electrode body, the feature of the manufacture method of described prismatic sealed secondary battery is, comprise: core body exposed division stacked group of part through-thickness stacked for the plat part part of the flat electrode body i.e. core body exposed division of the first electrode is divided into two parts, and clamps the first operation of connecting conductive parts in this part; The second operation of config set electroplax respectively in two outmost surface of the stacked core body exposed division stacked group of part of the plat part part i.e. core body exposed division of the first electrode of flat electrode body; After described first operation and described second operation terminate, under the state being folded with described connecting conductive parts, make electric resistance welding take over the baton abut with described collector plate respectively, and apply voltage, and to described collector plate, described connecting conductive parts and be divided into stacked group of two-part core body exposed division to carry out the 3rd operation of resistance welded.
It should be noted that, in no particular order, arbitrary operation formerly for above-mentioned first operation and the second operation.
According to above-mentioned manufacture method, production efficiency prismatic sealed secondary battery corresponding to heavy-current discharge can be manufactured well.
In above-mentioned manufacture method, as the connecting conductive parts of described column, the parts of tubular can be used.
In addition, as the connecting conductive parts of described column, the parts that two front ends have recess can be used in.
In addition, as the connecting conductive parts of described column, the parts that two front ends have forwards outstanding curved surface can be used in.
In addition, the part opposed with the front end of connecting conductive parts that can be used in described collector plate is formed with the collector plate of protuberance.
In addition, as the connecting conductive parts of described column, the parts that its waist portion is provided with resin-made strengthening part can be used in.
In addition, as described flat electrode body, can use and described first battery lead plate and described second battery lead plate be clipped the Scrawl flat electrode body that Scrawl electrode body that dividing plate reels stacked is processed into flat.
Invention effect
As described above, according to the present invention, can provide a kind of and can correspond to the large prismatic sealed secondary battery with excellent current collecting efficiency and current collection stability exporting electric discharge.
Accompanying drawing explanation
Fig. 1 is the stereogram of the outward appearance of the prismatic sealed secondary battery representing execution mode 1.
Fig. 2 is the front view of the positive-negative electrode plate representing execution mode 1.
Fig. 3 is the stereogram of the flat electrode body of execution mode 1.
Fig. 4 is the stereogram of the shape of the collector plate parts representing execution mode 1.
Fig. 5 is the figure of the column connecting conductive parts representing execution mode 1, and (a) is vertical view, and (b) is front view.
Fig. 6 is the figure of the connecting conductive parts of the band strengthening part representing execution mode 1, and (a) is vertical view, and (b) is front view.
Fig. 7 represents the cutaway view collector plate parts of execution mode 1 being arranged on the state on hush panel and outside lead-out terminal.
Fig. 8 is the figure of the situation representing resistance welded column connecting conductive parts and collector plate parts in flat electrode body in execution mode 1.
Fig. 9 is the figure being provided with the flat electrode body of each parts of slip ring system representing execution mode 1, and (a) is front view, and (b) is end view, and (c) is Y-Y cutaway view.
Figure 10 is the figure representing the connecting conductive parts of another way and the connecting member of band strengthening part.
Figure 11 is the figure of the collector plate representing another way, and (a) is front view, and (b) is the Z-Z cutaway view of (a).
Figure 12 is the stereogram of the collector plate parts representing another way.
Figure 13 is the figure of the inside battery structure of the another way representing use column connecting conductive parts.
Symbol description:
1 rectangular cell case
2 hush panel
2 a hush panel through holes
The outside lead-out terminal of 3 positive poles
4 negative outer lead-out terminals
5 positive plates
5a positive electrode active material layer
5b positive pole core body exposed division
6 negative plates
6a negative electrode active material layer
6b negative pole core body exposed division
10 flat electrode body
11 plat parts
12 stacked group of positive pole core body exposed divisions
12 ' stacked group of the positive pole core body exposed division split
13 liang of partitioning boundaries
20 collector plate parts
20a core body abutting part
20b external connecting
20c installing hole
20d leading part
30 column connecting conductive parts
30a recess
The connecting conductive parts of 31 band strengthening parts
32 resin-made strengthening parts
33 collector plates with protuberance
34 protuberances
The 35 collector plate parts with protuberance
40 welding electrode rods
50 insulating elements
Embodiment
(execution mode 1)
Illustrate for implementing mode of the present invention for the lithium rechargeable battery of the flat electrode body using Scrawl.Fig. 1 is the outside drawing of the lithium rechargeable battery (prismatic sealed secondary battery) of the flat vortex electrode body using Scrawl.As shown in Figure 1, the lithium rechargeable battery of execution mode 1 has rectangular cell case 1, the hush panel 2 of sealed prismatic battery case 1 opening, positive pole outside lead-out terminal 3, the negative outer lead-out terminal 4 given prominence to outward from hush panel 2, contains the flat electrode body 10 of staple and Scrawl in the inside of rectangular cell case 1.
Fig. 2 is the front view of the positive-negative electrode plate schematically describing the lithium rechargeable battery employing execution mode 1.In the figure, Fig. 2 (a) is positive plate 5, and Fig. 2 (b) is negative plate 6.It should be noted that, can using any one of positive-negative electrode plate as the first battery lead plate.Positive-negative electrode plate is all be coated with active material at its table back side except an end of the length direction along banded electrode core body, and the part 5a, the 6a that are coated with active material become electric surface.The part of uncoated active material is core body exposed division 5b, 6b, realizes current collection from this part.
Above-mentioned positive-negative electrode plate clips dividing plate between, by opposed for core body exposed division 5b, 6b broad ways and overlap, be wound into vortex shape and become electrode body.This electrode body is pressed along rolling thickness direction and is processed into flat and makes flat electrode body 10.The flat electrode body 10 of the Scrawl of making like this become positive pole core body extending part in the side of its both ends of the surface and negative pole core body extending part in the structure of opposite side.
Below, the details of the prismatic sealed secondary battery of execution mode 1 and the manufacture method of lithium rechargeable battery is described successively with reference to accompanying drawing.But the present invention is not defined as this manufacture method.
The making > of < positive plate
Will by cobalt acid lithium (LiCoO 2) the carbon series conductive agent such as positive active material, acetylene black or graphite of forming, the binding agent that is made up of Kynoar (PVDF) adopt according to quantity with the ratio of mass ratio 90: 5: 5, after they being dissolved in organic solvent be made up of METHYLPYRROLIDONE etc., carry out mixing and being modulated into positive active material slurry.
Next, use chill coating machine or scraper etc., by length 10000m, above-mentioned positive active material slurry coating uniform thickness is formed positive electrode active material layer 5a by the two sides of the positive pole core body of the banded aluminium foil formation of the wide cut that thickness is 7.5 μm.Now, along its length end (two sides is all unidirectional end) of positive pole core body does not apply slurry, and its core body is exposed, form positive pole core body exposed division 5b.
Making this pole plate by removing above-mentioned organic solvent in drying machine, making dry pole plate.Use roll-type stamping machine to be rolled into by this dry pole plate to make its thickness for 0.06mm and form positive electrode substrate, and this positive electrode substrate is cut out width 100mm short palisade and as positive plate 5 (Fig. 2 (a)).This positive plate 5 width 100mm, positive pole core body exposed division width 10mm, length 6000mm.
The making > of < negative plate
The negative electrode active material be made up of the Delanium of volume average particle size 20 μm, the binding agent be made up of butadiene-styrene rubber, the tackifier that are made up of carboxymethyl cellulose are adopted according to quantity with the ratio of mass ratio 98: 1: 1, they are mixed with appropriate water, modulates negative electrode active material slurry.
Next, use chill coating machine or scraper etc., by length 10000m, this negative electrode active material slurry is applied uniform thickness by the two sides of the negative pole core body of the Copper Foil formation of the band shape that thickness is 12 μm and forms negative electrode active material layer 6a.Now, along its length end (two sides is all unidirectional end) of negative pole core body does not apply slurry, and form the core body exposed division 6b making core body keep exposing state.
Carry out processing in the same manner as the situation of positive plate to this pole plate, making the battery lead plate thickness being formed with active material layer is the negative electrode substrate of 0.05mm, this negative electrode substrate is cut out short palisade that width is 110mm and as negative plate 6 (Fig. 2 (b)).This negative plate 6 width 110mm, negative pole core body exposed division width 8mm, length 6200mm.
It should be noted that, negative electrode active material is not limited to above-mentioned Delanium.Can be replaced or therewith use the Carbonaceous matters such as native graphite, carbon black, coke, vitreous carbon, carbon fiber or their sintered body or use described Carbonaceous matter and more than one mixtures mixed mutually selected in the group formed from lithium, lithium alloy and the metal oxide that can absorb, release lithium.
The making > of < flat electrode body
Coincide with each other directly to make the core body exposed division of homopolarity, make different core body exposed divisions outstanding to opposite side in coiling direction toward each other, and between different active material layers the mode of inevitable sandwiched dividing plate, above-mentioned positive plate, negative plate and these three parts contrapositions of dividing plate of being made up of polyethylene microporous film (thickness is 0.022mm) are overlapped, by winder winding around 44 circles, and the only winding of insulating properties is utilized to stop winding terminal.From the pressurization of rolling thickness direction, flat is formed to this vortex coiling body, is made the flat electrode body 10 of Scrawl.The stereogram of the flat electrode body 10 of this Scrawl as shown in Figure 3.
The shape of the flat electrode body 10 of Scrawl is described based on Fig. 3.Positive-negative electrode plate winding 44 circle forms by the flat electrode body 10 of Scrawl, the positive pole core body exposed division stacked group 12 of the stacked positive pole core body exposed division 5b of winding is formed in the end under the overlooking of thickness direction, the other end is formed stacked stacked group of the negative pole core body exposed division (the dark side of Fig. 3) of negative pole core body exposed division 6b of winding, the middle body (region except the bend of left and right) under this is overlooked is formed with plat part 11.
It should be noted that, the symbol 13 of Fig. 3 refers to and positive pole core body exposed division is divided into two-part part for stacked group 12.This part is called two partitioning boundaries, is the positive pole core body stacked group of exposed division (12 ') of segmentation by the positive pole core body exposed division laminating composition of segmentation another name.
The whole thickness of the positive pole core body exposed division in the plat part of this execution mode 1 stacked group 12 (the stacked number of positive pole core body is 88) is 660 μm, is divided into the respective thickness of two-part positive pole core body stacked group of exposed division (12 ') to be 330 μm.
< collector plate parts >
Fig. 4 represents collector plate parts.The aluminium sheet of these collector plate parts 20 couples of thickness 0.8mm carries out stamping-out, bending machining and making, and is formed with: the external connecting 20b with the installing hole 20c on lead-out terminal mounted externally; Two leading parts 20d, 20d linking with external connecting 20b; Core body abutting part 20a, 20a of linking with two leading parts 20d, 20d respectively.As shown in Figure 4, core body abutting part 20a, 20a are L-shaped shape, and the plane of external connecting 20b is vertically formed relative to the length direction of core body abutting part 20a.
At this, in the collector plate parts 20 of Fig. 4, core body abutting part 20a, 20a correspond to the collector plate of narrow sense.The present invention is with the collector plate directly abutted with core body exposed division for must key element, but the method for attachment of collector plate and outside lead-out terminal is not limited in any way.Thus, the collector plate parts 20 of the shape shown in Fig. 4 are not limited to.And core body abutting part 20a, 20a of Fig. 4 are processed to L-shaped shape, but collector plate is not have to be this kind of shape.And, in the collector plate parts 20 of Fig. 4, there are two legs (leading part and core body abutting part), but this leg also can be made to be one.Such as, can be that the collector body of a side has the leading part and core body abutting part that link with external connecting, the collector body of the opposing party have leading part and is only made up of core body abutting part.Wherein, the collector plate parts 20 of shape shown in Fig. 4 are excellent in battery assembling operation and electrical collector, therefore preferably.
< is with the connecting conductive parts > of strengthening part
In execution mode 1, the column connecting conductive parts covered by resin-made strengthening part are prepared around.Fig. 5 (a) represents the vertical view from top view column connecting conductive parts, and Fig. 5 (b) represents front view.And Fig. 6 (a) represents the vertical view of the connecting conductive parts of the resin parts that the surrounding of post is covered by resin-made strengthening part, and Fig. 6 (b) represents front view.
As shown in Figure 5, these connecting conductive parts 30 are cylindric, are formed with recess at two leading sections.As shown in Figure 6, the connecting conductive parts 31 of resin parts are following shape: on the side of connecting conductive parts 30, and two front ends of connecting conductive parts 30 are slightly outstanding and be glued with the resin-made strengthening part 32 shorter than the height of connecting conductive parts.It should be noted that, the column connecting conductive parts 30 surrounding covered by resin-made strengthening part 32 are called " the connecting conductive parts of band strengthening part ".
The simple shape of above-mentioned connecting conductive parts, is therefore easily formed by conductive material, such as, the alloy of the conductive metal such as aluminium, copper, nickel, zinc, iron or described metal can be used to make.As the material of connecting conductive parts, preferably excellent relative to the chemical stability of electrolyte and the metal material that discharge and recharge patience is excellent, is namely preferably applicable to the material welded with electrode core body.Such as, the conductivity connecting member of the positive pole as lithium rechargeable battery, preferred aluminum or aluminum alloy, as negative pole connecting conductive parts, preferably copper or copper alloy or tough pitch copper.
On the other hand, as resin-made strengthening part, preferred mechanical good strength and not melting or softening resin under heat when resistance welded, from formability aspect preferred thermoplastic resin, more preferably have the resin of insulating properties.As the resin possessing this kind of character, there are such as polypropylene (PP), polyethylene (PE), Vingon (PVDC), polyacetals (POM), polyamide (PA), Merlon (PC), polyphenylene sulfide (PPS) etc.From cheap and can the aspect of stable supplying, especially preferably use PP, PE.
Resin-made strengthening part easily can be made by the injection molding employing such as thermoplastic resin.According to injection molding, by forming the hole of confession column connecting conductive parts insertion or make hardening of resin around column connecting conductive parts simultaneously, and the one-piece type column connecting conductive parts of strengthening part (the connecting conductive parts of band strengthening part) can be made.
The size of column connecting conductive parts and resin-made strengthening part is described.In execution mode 1, the body diameter of connecting conductive parts is 3mm, is highly 12mm, and the recess diameter of recess is 1mm, and the profile diameter of resin-made strengthening part is 6mm, is highly 10mm.Wherein, the size of described parts considers that the thickness of stacked group of flat electrode body or generate output etc. suitably set.
< electrolyte >
Dissolve the LiPF as electrolytic salt using the ratio of 1.0M (mol/L) in nonaqueous solvents ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC) are mixed into the ratio of volume ratio 1: 1: 8 (1 air pressure, 25 DEG C) 6after electrolyte.
The assembling > of < battery
Side of the positive electrode is described.First, collector plate parts 20 are connected with outside lead-out terminal 3.Fig. 7 represents the slip ring system structure of hush panel periphery.As shown in Figure 7, the slip ring system of hush panel periphery is configuration insulating element 50 between the lower surface and the external connecting 20b of collector plate parts 20 of hush panel 2 and between the upper surface of hush panel 2 and the perimeter flange portion of outside lead-out terminal 3 and around the through hole 2a that hush panel 2 is arranged, to the structure insulated between hush panel 2 and collector plate parts 20 and outside lead-out terminal 3.
The assembling sequence of the slip ring system of hush panel periphery is as described below.The established part of hush panel 2 configures insulating element 50.The face (insulating element 50 face) making the external connecting 20b of collector plate parts be positioned at the inner side of hush panel 2 is communicated with the through hole 2a of hush panel 2 to make its installing hole 20c.Then outside lead-out terminal 3 is inserted into through hole 2a and installing hole 20c, carries out expanding to the bottom of outside lead-out terminal 3 in this condition and the external connecting 20b of collector plate parts 20 and outside lead-out terminal 3 are fastened and fixed in hush panel 2.Become each part integration thus and outside lead-out terminal 3 and collector plate parts 20 are connected into the state that can be energized.
For negative pole system, to carry out also equally with the situation of positive polar system.By this order, the entirety being connected with hush panel 2, outside lead-out terminal 3 and collector plate parts is called outside lead-out terminal side current collecting body.
The structural order of the slip ring system on following explanation flat electrode side, i.e. the welding sequence of flat electrode body and collector plate parts and connecting conductive parts.Fig. 8 represents the generalized section to the situation that flat electrode body 10, collector plate parts 20 and connecting conductive parts 30 weld.As shown in Figure 8, two are made to be with the connecting conductive parts 31 of strengthening part mutually to leave configuration between two partitioning boundaries 13 of flat electrode body 10.
In addition, two outer surfaces that the outside lead-out terminal side current collecting body of above-mentioned making is configured to the core body abutting part of positive and negative collector plate parts and the plat part surface of flat electrode body 10 and core body exposed division 5b, 6b are exposed are abutted respectively.
Then, about positive polar system, as shown in Figure 8, the lateral surface of welding electrode rod 40 contact core body abutting part 20a is made, press core body exposed division stacked group 12 from above-below direction with the plus-pressure of about 100 ~ 200kg, and flow through the electric current of 12 ~ 18kA therebetween at this part such as 13 ~ 15ms.Thus resistance welded is carried out to each parts.Positive polar system, negative pole system are not always the case and two connecting conductive parts are carried out resistance welded successively with respective stacked group of core body exposed division (12 ') respectively.
By this resistance welded, about positive polar system, two-part core body exposed division will be divided into connect to for stacked group 12 by two partitioning boundaries 13 by being with the connecting conductive parts 31 of strengthening part can be energized, and core body exposed division 5a will be connected with the core body abutting part 20a of collector plate parts 20.Further, because collector plate parts 20 are connected with outside lead-out terminal 3 via external connecting 20b, therefore by this resistance welded, and side's electrode (positive pole) of flat electrode body and outside lead-out terminal are connected into and can be energized.About negative pole system too.
Then, flat electrode body 10 is inserted in rectangular cell case 1, hush panel 2 is fitted together at the peristome of rectangular cell case 1, laser welding is carried out to the surrounding of hush panel 2 and the junction surface of rectangular cell case 1, inject above-mentioned electrolyte from the electrolyte injecting hole be arranged on hush panel 2 (not shown), then inject the electrolyte into hole airtight.Thus, the square lithium ion secondary battery of execution mode 1 is completed.
Fig. 9 illustrates the generalized section of the internal structure of the lithium rechargeable battery representing execution mode 1.Fig. 9 (a) is the front view having had an X-rayed rectangular cell case inside of arrow X-direction in FIG, and Fig. 9 (b) is its left side view, and Fig. 9 (c) is the Y-Y line cutaway view of Fig. 9 (a).Core body exposed division laminating composition is slit into two parts by this lithium rechargeable battery, be divided into two column connecting members between two-part core body exposed division stacked group 12 ', 12 ' by being configured in and realizing being divided into the conducting each other of stacked group of two-part core body exposed division, and collector plate (the core body abutting part 20a of collector plate parts) is abutted with being divided into the respective outmost surface of two-part core body exposed division stacked group 12 ', 12 '.
By adopting this kind of current collecting, can realize electrical collector and be difficult to timeliness deterioration occurs in execution mode 1, what the minimum and reliability of current collection resistance was excellent corresponds to the large prismatic sealed secondary battery exported.
(other execution modes)
<1> connecting conductive parts and resin-made strengthening part
In above-mentioned execution mode 1, employ the connecting conductive parts 31 of the band strengthening part surrounded by resin-made strengthening part around it, but also can be used alone the column connecting conductive parts 30 that resin-made strengthening part 32 is not set.
In addition, also can be substituted in the column connecting conductive parts that two front ends are provided with recess 30a, and be used alone the column connecting conductive parts of the shape shown in Figure 10 (a) ~ (c).At this, the connecting conductive parts of the cylindrical shape in Figure 10 (a) to be axle center be cavity, Figure 10 (b) is the column connecting conductive parts two front ends being processed into convex surface shape, and Figure 10 (c) is the column connecting conductive parts that leading section is smooth.
In addition, also can around the various column connecting conductive parts shown in Figure 10 (a) ~ (c) configuration resin-made strengthening part, and as band strengthening part connecting conductive parts ((2) of Figure 10 (a) ~ (c)) use.
In addition, as long as column connecting conductive parts column, regardless of its cross sectional shape (cross section orthogonal with axle center), therefore can replace circle and use polygon-shaped, ellipticity, other shapes of being out of shape column connecting conductive parts.
In addition, the aspect of cross sectional shape not circumscribed is identical with resin-made strengthening part.And, resin-made strengthening part, without the need to being formed as the shape of the complete cycle of the waist portion (trunk returns り) covering column connecting conductive parts completely, also can be at the resin-made strengthening part being partially formed cut out portion (such as along the crack of axis direction).
<2> collector plate
In execution mode 1, employ the collector plate parts shown in Fig. 4, but as mentioned above, be not limited to this collector plate parts.Such as also can be used in the collector plate 33 that the middle body shown in Figure 11 has protuberance 34 outstanding outward.This kind of protuberance 34 also can be arranged on the core body abutting part 20a of described collecting member 20.Figure 12 represents the collector plate parts 35 with protuberance 34.
Be formed in the collector plate of protuberance (projection) or the execution mode of collector plate parts in use, need jut is positioned on the extended line in the axle center of column connecting conductive parts.When utilizing welding electrode rod pressing collector plate etc. in this condition, the front end of stacked group of core body exposed division and column connecting conductive parts is with pin point (ピ Application Port イ Application ト) pressing.Thus, the resistance welded of the high-quality of pin point can be carried out.
In addition, at collector plate being formed with protuberance etc. with when being formed with the combination of column connecting conductive parts of recess in front end, the recess of column connecting conductive parts engages with the protuberance of collector plate etc., therefore easily fixes column connecting conductive parts, thus improves weld job.
In addition, in above-mentioned execution mode 1, be formed as configuring a pair collector plate parts on two outer surfaces of the core body exposed division of plat part and the mode that they are connected with outside lead-out terminal respectively, but also can be formed as only by mode that a side is connected with outside lead-out terminal.Such as can be formed as the collector plate of a side is only worked as welding bearing part, and the collector plate of the opposing party opposed with it and outside lead-out terminal are connected into the mode that can be energized.
The use number of <3> column connecting conductive parts
In above-mentioned execution mode 1, the partitioning boundary part of the flat electrode body of Scrawl is configured with the connecting conductive parts of two band strengthening parts, but the use number of column connecting conductive parts can be also 1 as shown in figure 13, also can be more than 3.
In addition, in above-mentioned execution mode 1, show the example of convoluted flat electrode body, but the present invention also can be applicable to cascade type.
In addition, in above-mentioned execution mode 1, show positive and negative two battery lead plates all (both ends of flat electrode body all) adopt the example of slip ring system structure of the present invention, but slip ring system structure of the present invention is only applicable to side's battery lead plate also can obtain certain effect.
In addition, in above-mentioned execution mode 1, show the example of lithium rechargeable battery, but the present invention is not limited to lithium rechargeable battery.Such as, the prismatic sealed secondary battery such as nickel-hydrogen dattery, nickel-cadmium accumulator can be applicable to.
Industrial applicibility
According to the present invention, can provide a kind of can not cause significantly cost increase and current collecting efficiency and current collection excellent in stability can correspond to the large prismatic sealed secondary battery exporting electric discharge.Thus, its industrial applicibility is high.

Claims (13)

1. a prismatic sealed secondary battery, at least comprises:
This first battery lead plate and this second battery lead plate clipped the stacked or flat electrode body be laminated that reels of dividing plate to make the first battery lead plate and the second battery lead plate core body exposed division separately mode opposed in the direction of the width, this first battery lead plate is formed with core body exposed division in the end side of Width, and this second battery lead plate is formed with core body exposed division and different from the polarity of described first battery lead plate in the end side of Width;
The collector plate engaged with described first battery lead plate;
The outside lead-out terminal that can be energized is connected into via described collector plate and described first battery lead plate;
Accommodate the rectangular cell case of described flat electrode body;
Seal the hush panel of the opening of described rectangular cell case,
The feature of described prismatic sealed secondary battery is,
The plat part part of the outermost layer part that a pair collector plate exposes at the core body exposed division of the first battery lead plate forming described flat electrode body and described flat electrode body configures in the mode clipping this plat part part from thickness direction,
Stacked group of core body exposed division in the plat part part clipped by described a pair collector plate is divided into two parts, and the connecting conductive parts of column clamp between these two portions,
Described a pair collector plate, described connecting conductive parts and be divided into two-part core body exposed division stacked group of soldered joint,
Described prismatic sealed secondary battery also possesses collector plate parts, and these collector plate parts are formed with external connecting, two leading parts linking with described external connecting and a pair core body abutting part linked with described two leading parts respectively,
Described a pair core body abutting part is described a pair collector plate,
Described outside lead-out terminal is connected with described external connecting,
Described outside lead-out terminal is formed through the through hole in described hush panel, and gives prominence to outward from described hush panel.
2. prismatic sealed secondary battery according to claim 1, is characterized in that,
The connecting conductive parts of described column are formed with forwards outstanding curved surface in two front ends abutted with described core body exposed division.
3. prismatic sealed secondary battery according to claim 1, is characterized in that,
Two front ends that connecting conductive parts are abutting with described core body exposed division of described column are formed with recess.
4. prismatic sealed secondary battery according to claim 1, is characterized in that,
The connecting conductive parts of described column are tubular.
5. prismatic sealed secondary battery according to claim 3, is characterized in that,
Described collector plate is provided with the protuberance opposed with the front end of described connecting conductive parts on its surface.
6. the prismatic sealed secondary battery according to any one of Claims 1 to 5, is characterized in that,
Resin-made strengthening part is provided with at the waist portion of the connecting conductive parts of described column.
7. the prismatic sealed secondary battery according to any one of Claims 1 to 5, is characterized in that,
Described flat electrode body is that the Scrawl electrode body described first battery lead plate and described second battery lead plate being clipped dividing plate winding is processed into the Scrawl flat electrode body of flat.
8. the manufacture method of a prismatic sealed secondary battery, described secondary cell at least possesses: this first battery lead plate and this second battery lead plate clipped the stacked or flat electrode body be laminated that reels of dividing plate to make the first battery lead plate and the second battery lead plate core body exposed division separately mode opposed in the direction of the width, this first battery lead plate is formed with core body exposed division in the end side of Width, and this second battery lead plate is formed with core body exposed division and different from the polarity of described first battery lead plate in the end side of Width; The collector plate engaged with described first battery lead plate; The outside lead-out terminal that can be energized is connected into via described collector plate and described first battery lead plate; Accommodate the rectangular cell case of described flat electrode body, the feature of the manufacture method of described prismatic sealed secondary battery is, comprising:
Core body exposed division stacked group of part through-thickness stacked for the plat part part of the flat electrode body i.e. core body exposed division of the first electrode is divided into two parts, and the first operation of the connecting conductive parts of column is clamped in this part, be provided with resin-made strengthening part at the waist portion of the connecting conductive parts of described column;
The second operation of config set electroplax respectively in two outmost surface of the stacked core body exposed division stacked group of part of the plat part part i.e. core body exposed division of the first electrode of flat electrode body;
After described first operation and described second operation terminate, under the state being folded with described connecting conductive parts, make electric resistance welding take over the baton abut with described collector plate respectively, and apply voltage, and to described collector plate, described connecting conductive parts and be divided into stacked group of two-part core body exposed division to carry out the 3rd operation of resistance welded.
9. the manufacture method of prismatic sealed secondary battery according to claim 8, is characterized in that,
Use the connecting conductive parts of parts as described column of tubular.
10. the manufacture method of prismatic sealed secondary battery according to claim 8, is characterized in that,
Be used in the connecting conductive parts of parts as described column that two front ends have recess.
The manufacture method of 11. prismatic sealed secondary batteries according to claim 8, is characterized in that,
Be used in the connecting conductive parts of parts as described column that two front ends have forwards outstanding curved surface.
The manufacture method of the prismatic sealed secondary battery according to any one of 12. according to Claim 8 ~ 11, is characterized in that,
The part opposed with the front end of connecting conductive parts of described collector plate is formed with protuberance.
The manufacture method of 13. prismatic sealed secondary batteries according to claim 12, is characterized in that,
As described flat electrode body, use and described first battery lead plate and described second battery lead plate clipped the Scrawl flat electrode body that Scrawl electrode body that dividing plate reels stacked is processed into flat.
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